My Bride is a Mermaid

Nagasumi is in hot water after Sun, a cute mermaid, saves him from drowning. Her dad is a merman Yakuza prone to executing anyone who learns his family's scaly secret! Luckily, there's a catch: if Nagasumi agrees to marry Sun, he can avoid sleeping with the fishes! The kid's in over his head, but there's no denying the mermaid's allure. Nagasumi's hooked, and Sun's ready to come ashore!